India, which has had an uneasy relationship with China for decades, has long fretted over Beijing's military cooperation with its South Asian neighbours, especially Pakistan.
              
It is also worried China is creating a so-called 'string of pearls' across the Indian Ocean by funding port developments in Pakistan, Sri Lanka, Myanmar and Bangladesh.
              
Modi has won parliamentary approval for an agreement that will transfer a small amount of territory to Bangladesh that previous Indian governments failed to ratify for fear of a domestic backlash. The issue dates back to British India's partition in 1947.
              
The Prime Minister has also persuaded a regional Indian leader to drop her opposition to share water equally from a key river that flows through India before reaching Bangladesh.
              
The migration of tens of thousands of people from Bangladesh into India has long been a sensitive issue in India.

Srikanth Kondapalli, a China expert at New Delhi's Jawaharlal Nehru University, said China had built close ties with Bangladesh as part of its South Asia diplomacy and that this was a concern for India.

"The number of PLA visits to Bangladesh is nearly the same as to India," he said, referring to China's People's Liberation Army. "Modi is trying to counter it with his neighbourhood outreach."

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